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@article{AMLG_1981__21_137976, author = {T.v.d. Twer}, title = {On the strength of several versions of {Dirichlet's} (}, journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung}, pages = {69--76}, publisher = {mathdoc}, volume = {21}, year = {1981}, zbl = {0467.03060}, url = {http://geodesic.mathdoc.fr/item/AMLG_1981__21_137976/} }
T.v.d. Twer. On the strength of several versions of Dirichlet's (. Archiv für mathematische Logik und Grundlagenforschung, Tome 21 (1981), pp. 69-76. http://geodesic.mathdoc.fr/item/AMLG_1981__21_137976/